auto save

diy2.py

+username = "python"
+userpassword = "123456"
+i=0
+while True:
+    if i == 3:
+        print("你的账户已被锁定，请带身份证来我司解锁")
+        exit()
+    name = input("请输入用户名:")
+    password = input("请输入密码:")
+    if name == username and password == userpassword:
+        print("登录成功!")
+        break
+    if name!=username:
+        print("账号错误")
+        i+=1
+        continue
+    if password!=userpassword:
+        print("密码错误")
+        i+=1
+print("欢迎来到贝尔编程!")